SQL - select

I want to be able to select user by id number or I want to be able to select all users in a single store procedure.
How can I do this?

create procedure sp_username

@id int
as
select id, username from mytable
where id = @id



create procedure sp_username

@id int = null ???
as
select id, username from mytable
where id = @id
VBdotnet2005Asked:
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Jim HornMicrosoft SQL Server Data DudeCommented:
Here you go.  NULL serves as the 'ALL' choice.
create procedure sp_username (@id int = NULL) AS 

select id, username 
from mytable
where (id = @id or @id IS NULL) 
GO

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VBdotnet2005Author Commented:
Thank you Jim
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Microsoft SQL Server 2008

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